Here’s a useful list of resources on how to create an API, categorized by programming language. (We also have a post on 30+ ways to make a REST call in different languages)
As an API Marketplace, Mashape helps developers discover, consume, distribute, and monetize private and public APIs. We hope that the tutorials below would help you in your API journey.
(If you’re looking for examples of APIs, check here for a list of face recognition APIs)

After the successful launch of Unirest, an open source lightweight http client library, we received a lot of requests for a C# .NET port on Windows Desktop and Windows 8. Even before we got to work, we’ve received contributions from the open source community who ported Unirest to .NET.
This tutorial will show you how to use the Windows 8 (RT) port of Unirest in your application (We will follow this up with the Windows Desktop port in a later post, but it will follow pretty much the same steps). Let’s get started!
NOTE: We will be updating this…

In this short tutorial we will use Python in our Mac Terminal to consume one of the Machine Learning APIs in this list. Let’s pick DuckDuckGo.
DuckDuckGo lets us define people, places, things, words, and concepts. It also provides a list of related topics. This is very useful if you want to get some context on a certain text.
Although we’re picking DuckDuckGo, note that the steps below also applies to the rest of the APIs in the Machine Learning APIs list, and all Mashape APIs. That means you can swap in and swap out APIs for…

This is a quick tutorial on how to transcribe and extract topics from videos using the Yactraq Speech2Topic API in Mashape.
(Note: Yactraq is giving away $500 to the winner Yactraq category for this coming Mashape April Hackathon on Apr 6th, 2013. We require a number of teams to submit to this category to unlock the prize :))
This is particularly useful if you’re trying to get context in the video, which can be used to query ad services to pull relevant content.
The process is very simple, we send a link (YouTube) of a video to be processed by …

This is a quick video tutorial on how to add your API to Mashape. By adding your API to Mashape, you make it easy for developers to discover and test your API. You are also one step away from adding a billing mechanism to your API.
How to Add an API to Mashape from Chris Ismael on Vimeo.
Join us in Facebook, Twitter, or email us at support@mashape.com if you have any questions!…

UPDATE (Dec 10, 2013): The instructions below are outdated. Please head to this post on how to call Mashape APIs in your Android projects.
One of the ways that Mashape facilitates easy consumption of APIs is by offering auto-generated client libraries for several programming languages, for each of the APIs. You can see these as a row of buttons lined up in the middle-right section of each API page in Mashape.
Auto-generated client libraries
This saves both the API provider and consumer / developer a huge amount of coding time and manpower, which allows them to attend to more important…

This is a tutorial on how to add your API(s) to Mashape. Do note that things change quite often so if you’re reading this from the future, some things might have changed. But we’ll update this as often as we can so everyone’s on the same page (literally!).
Before we start, you would need a Mashape account. (You can skip this part if you’ve done this already). Go to http://www.mashape.com/ and click on the button in the upper-right hand section of the page that says “Join Us”. You’ll also have the option to sign up using your GitHub account.
After…

Applications created on Mashape can be included into other apps created on the platform, but their components can be also called from the outside using our API infrastructure.
This means that a published application has its own APIs and also the client libraries to call them using different popular technologies. For example, your app can be called from: